CAJ | 학술논문

东部区块是国家油气发展的重点勘探区块，该区块某地层段经常因井壁失稳造成井下事故，从而影响该地区油气勘探开发进度。基于实验室室内岩石力学评价方法对该区块页岩的矿物组成、微观结构及在流体浸泡作用下力学性质变化等分别进行了实验研究；并对该区块页岩进行了物性、力学状态等方面进行了深入分析研究。建立了井下岩芯的稳定性的评价分析体系，并对现如今该地区使用的2种钻井液进行优选。实验结果表明：井下某一组段岩芯微裂缝和溶洞发育，泥浆易浸入，导致页岩理化性质发生变化的同时，力学性质也发生变化。研究发现，随着浸泡时间增加，页岩硬度变弱；成膜钻井液体系比抗高温钻井液体系影响小。
동부구괴시국가유기발전적중점감탐구괴，해구괴모지층단경상인정벽실은조성정하사고，종이영향해지구유기감탐개발진도。기우실험실실내암석역학평개방법대해구괴혈암적광물조성、미관결구급재류체침포작용하역학성질변화등분별진행료실험연구；병대해구괴혈암진행료물성、역학상태등방면진행료심입분석연구。건립료정하암심적은정성적평개분석체계，병대현여금해지구사용적2충찬정액진행우선。실험결과표명：정하모일조단암심미렬봉화용동발육，니장역침입，도치혈암이화성질발생변화적동시，역학성질야발생변화。연구발현，수착침포시간증가，혈암경도변약；성막찬정액체계비항고온찬정액체계영향소。
The area is the main oil and gas exploration and devel-opment blocks of China. The underground accidents were often caused by the wellbore instability in some Formation, which al-ways influences oilfield development progress. Based on the rock mechanics evaluation method, the mineral composition, micro-structure and mechanical properties and those items under immer-sion fluid are obtained by experiments about the shale from the ar-ea. The mechanical properties, physical properties and mechanics properties of the core are deeply analyzed for this block. Then, the evaluation analysis system about the stability of the underground core is established, which could be used for the preferred drilling fluid in this area. Experimental results are shown that the micro fis-sure and caverns are well developed on the cores from that forma-tion of the area. The mud easily penetrated into the shale, which changed the physical properties, chemical properties and mechani-cal properties of the shale. The research also finds that the shale hardness become worse with longer the mud immersing. The film forming drilling fluid system is much better than the Anti-high tem-perature drilling fluid system.